linux-disk-change

Guide of changing primary disk , resize disk or downgrade disk

=== Process of Disk Change/migration ======

sudo parted /dev/vdb mklabel gpt
sudo parted /dev/vdb mkpart biosboot 1MiB 3MiB
sudo parted /dev/vdb set 1 bios_grub on
sudo parted /dev/vdb mkpart primary ext4 3MiB 100%
sudo mkfs.ext4 /dev/vdb2
fdisk -l
lsblk
sudo blkid -s UUID -o value /dev/vdb2
sudo mkdir /mnt/vda
sudo mkdir /mnt/vdb
sudo mount /dev/vda2 /mnt/vda
sudo mount /dev/vdb2 /mnt/vdb

Copy all the data from primary disk to secondary disk

cd /mnt/vdb
sudo rsync -avxHAX --progress /mnt/vda/ /mnt/vdb/

==== Bind Mount Some System Directories =======

sudo mount --bind /dev /mnt/vdb/dev
sudo mount --bind /proc /mnt/vdb/proc
sudo mount --bind /sys /mnt/vdb/sys

===== Chroot into the Target System ======

sudo chroot /mnt/vdb

===== Install GRUB on the Target Disk ======

For BIOS Mode:

grub-install --target=i386-pc --recheck /dev/vdb 

or

For EFI Mode:

grub-install --recheck /dev/vdb

====== Generate GRUB Configuration ======

update-grub

===== Exit the chroot Environment =====

exit

===== Unmount Directories ==========

sudo umount /mnt/vdb/dev
sudo umount /mnt/vdb/proc
sudo umount /mnt/vdb/sys